Old Westbury, N.Y. — In a FedEx Cup playoff opener that felt like a heavyweight bout, Dustin Johnson delivered back-to-back blows to beat Jordan Spieth in The Northern Trust.

One was a putt from 18 feet.

The other was a drive that traveled 341 yards.

Down to his last shot, Johnson watched his 18-foot par putt stay on the high side of the hole and thought for sure it would miss. He took two steps of hope to the right, and then pumped his fist in a rare show of emotion when it swirled around and dropped in the back side of the cup for a 4-under 66 to force a playoff.

Given new life, Johnson relied on his strength and powered a drive over the lake to the far edge of the fairway. It was the longest drive all week on the 18th hole, and it left him a 60-degree wedge to 4 feet for birdie and a victory he badly needed.

The No. 1 player in golf finally looked the part again.

“It was fun to be in the hunt again and know that my game is going to hold up under pressure,” Johnson said.

Spieth lost for the first time in six tries when leading by two shots or more, and there wasn’t much he could do except take back that tee shot into the water on the par-3 sixth hole after building a five-shot lead. Johnson played bogey-free over the final 29 holes.

“I didn’t lose the tournament,” Spieth said after closing with a 69. “He won it.”

It was great theater between Johnson and Spieth, good friends who now are No. 1 and No. 2 in the world.

“I thought that was a fun show,” Spieth said. “I was hoping it wasn’t going to be that much fun.”

Johnson made up a five-shot deficit in five holes, and they battled along the back nine with big shots and big moments.

They were tied on the par-3 17th when both hit into a bunker, and Johnson blasted out to 4 feet with an easier shot and angle to the hole. Spieth had 18 feet for par and knocked it in, like he always seems to do.

On the closing hole, Johnson showed the kind of golf I.Q. that belies his simple outlook on life. After he sliced his drive up the hill and into a nasty lie in the rough, he chose to lay up instead of trying to hammer a shot to an elevated green.

But he made it pay off with a par that got him into the playoff after Spieth lagged a 75-foot putt perfectly to get his par.

They finished at 13-under 267.

Johnson was angry with himself after his tee shot in regulation for not taking it over the water, even with a light wind in his face.

“Right after I hit my drive, I was like, ‘What am I doing?’ ” Johnson said. He told his caddie, brother Austin Johnson, that if they got into a playoff, he wouldn’t make the same mistake twice. It took the most clutch putt Johnson has made in his career, and he blasted his best drive of the week.

Spieth knew it was going to be tough when they returned to the tee and felt the wind switch in their favor.

“I was hoping he was not going to notice that,” Spieth said.

Johnson won for the first time since he wrenched his back during a spill down the stairs that knocked him out of the Masters and derailed his dominance in golf. He had won three straight tournaments against strong fields until that injury.

“I feel like the game is finally back in form like it was before the Masters,” Johnson said.

Of his 16 victories, this was the first time Johnson faced a must-make putt on the final hole, and he delivered a par putt that even Spieth thought was going to miss on the high side of the hole.

“But his body language was hanging in,” Spieth said. “I’m like, ‘Does that really still have a chance?’ And it came around and lipped it. My initial thought was, ‘I just did that exact thing to him the hole before.’ ”

The Northern Trust never looked as though it would contain so much drama.

Spieth began with a three-shot lead and he stretched it to five shots with a 30-foot birdie putt on the fifth hole.

Five holes later, they were tied.

Spieth’s tee shot on the next hole banged off the rock wall and into the water on the par-3 sixth, and he made double bogey. On the ninth hole, Spieth took three putts from just off the left side the green, and Johnson made a 7-foot birdie putt for another two-shot swing.

No one else really had a chance.

Jon Rahm (68) ran off three straight birdies early on the back and briefly was one shot behind, though he had stronger holes ahead of him and fell back. Jhonattan Vegas (65) was within two shots after playing the scoring holes. They tied for third, four shots behind.

Otherwise, it was a matter of who finished among the top 100 in the FedEx Cup to move on to the TPC Boston next week for the second playoff event.

Bubba Watson shot a 70 and tied for 10th, to become one of eight players to qualify for the second playoff event all 11 years of the FedEx Cup. David Lingmerth and Harold Varner also moved into the top 100. That marked the fewest players outside the top 100 to advance since 2007.

Johnson moved to the top of the list. Spieth is right behind. They will play together the opening two rounds next week in Boston.

LPGA

At Ottawa, Ontario, Sung Hyun Park added the Canadian Pacific Women’s Open title to her U.S. Women’s Open crown with a comeback victory at Ottawa Hunt.

Park birdied the final hole for a 7-under 64 and a two-stroke victory over fellow South Korean player Mirim Lee. Four strokes behind leaders Nicole Broch Larsen and Mo Martin entering the round, Park finished at 13-under 271. She won the U.S. Women’s Open last month in New Jersey for her first LPGA Tour title.

Michelle Wie withdrew before the round and was taken to Ottawa Hospital for surgery to remove her appendix. Wie was tied for 23rd, six strokes back entering the day.

Larsen had a 70 to drop into a tie for third at 10 under with Cristie Kerr (69), In Gee Chun (70), Shanshan Feng (68) and Marina Alex (68). Martin was another stroke back after a 72.

Canadian star Brooke Henderson followed her course-record 63 with a 71 to tie for 12th at 7 under. The 19-year-old major champion is from nearby Smiths Falls.

Champions

At Snoqualmie, Washington, Jerry Kelly won the Boeing Classic for his first Champions title, closing with a 6-under 66 for a one-stroke victory over Jerry Smith.

Kelly tied Smith for the lead with a birdie on the par-4 16th and moved ahead with a 15-foot birdie putt on the par-3 17th. After Smith left an 8-foot birdie try short on the par-5 18th, Kelly pulled his 3 1/2-foot birdie attempt to the left and tapped in for the winning par.

Kelly had a tournament-record 19-under 197 total at TPC Snoqualmie Ridge. He opened with a 65 for a share of the lead and had a 66 on Saturday to take a three-stroke advantage into the final round. The three-time PGA Tour winner from Madison, Wisconsin, was making his 13th senior start after turning 50 in November.

Smith closed with a 64.

Bernhard Langer (65) and Billy Mayfair (66) tied for third at 16 under. Langer won the event in 2010 and 2016. He has a tour-high four victories this year, winning three of the tour’s five majors.

Colin Montgomerie (66) was fifth at 15 under.

Local favorite Fred Couples tied for 20th at 8 under after a 70.

Europe

At Farso, Denmark, Julian Suri carded a final round of 64 to win the Made in Denmark event and claim his first European Tour title in just his seventh appearance.

The American fired seven birdies and no bogeys at Himmerland Golf and Spa Resort to finish 19 under and four shots clear of overnight leader David Horsey, who triple-bogeyed the final hole.

Surgery for Wie

At Ottawa, Ontario, Michelle Wie was set to have surgery Sunday to remove her appendix.

Wie withdrew before the final round of the Canadian Pacific Women’s Open and was taken to Ottawa Hospital for the surgery.

“Further details on her condition will be provided when available,” her agency, IMG, said in a statement.

The 27-year-old Wie was tied for 23rd, six strokes behind leaders Mo Martin and Nicole Broch Larsen after three rounds at Ottawa Hunt.

Wie was 1-2-0 last week in the United States’ Solheim Cup victory over Europe in Iowa. Ranked 30th in the world, she tied for third in the Women’s British Open and has seven top-10 finishes this season.